Ticket #8707: timetest.cpp

#define _CRT_SECURE_NO_WARNINGS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>


typedef unsigned __int8  UI8;
typedef   signed __int8  SI8;
typedef unsigned __int16 UI16;
typedef   signed __int16 SI16;
typedef unsigned __int32 UI32;
typedef   signed __int32 SI32;
typedef unsigned __int64 UI64;
typedef   signed __int64 SI64;


typedef SI32 (NTAPI *PFN_NT_QUERY_PERFORMANCE_COUNTER)(OUT PLARGE_INTEGER PerformanceCounter, OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL);


int __cdecl main(void)
{
        LARGE_INTEGER PerformanceCounter, PerformanceFrequency;
        HMODULE Ntdll;
        PFN_NT_QUERY_PERFORMANCE_COUNTER NtQueryPerformanceCounter;
        UI64 StartTime, StartTick;
        SI32 Status;

        Ntdll = GetModuleHandleW(L"ntdll.dll");
        NtQueryPerformanceCounter = (PFN_NT_QUERY_PERFORMANCE_COUNTER) GetProcAddress(Ntdll, "NtQueryPerformanceCounter");

        // Take an initial sample of two time sources: the TSC and the HPET
        Status = NtQueryPerformanceCounter(&PerformanceCounter, &PerformanceFrequency);
        if (Status < 0)
        {
                printf("NtQueryPerformanceCounter(): %08X\n", Status);
                return 0;
        }

        StartTick = __rdtsc();
        StartTime = PerformanceCounter.QuadPart;

        printf("NtQueryPerformanceCounter(): CTR=0x%016llX FRQ=0x%016llX\r\n", PerformanceCounter.QuadPart, PerformanceFrequency.QuadPart);

        for(size_t i = 0; i < 60; i++)
        {
                UI64 EndTime, EndTick, DeltaTime, DeltaTick, TickRate;

                // Sleep for a while.
                Sleep(1000);

                // Sample the two clocks again. N.B. rdtsc is sampled *first* this time.
                EndTick = __rdtsc();
                Status = NtQueryPerformanceCounter(&PerformanceCounter, &PerformanceFrequency);
                if (Status < 0)
                {
                        printf("NtQueryPerformanceCounter(): %08X\n", Status);
                        return 0;
                }

                EndTime = PerformanceCounter.QuadPart;

                printf("NtQueryPerformanceCounter(): CTR=0x%016llX FRQ=0x%016llX\r\n", PerformanceCounter.QuadPart, PerformanceFrequency.QuadPart);

                DeltaTime = EndTime - StartTime;
                DeltaTick = EndTick - StartTick;
                TickRate = (DeltaTick * 10000000ull) / DeltaTime;

                printf("[%2u] TIME=+%llu.%03u  TICKS=+%llu  (%llu ticks/s)\r\n", i, DeltaTime / 10000000ull, (unsigned int)(DeltaTime % 10000000ull) / 10000, DeltaTick, TickRate);

                EndTick += DeltaTick;
                EndTime += DeltaTime;
        }

        return 0;
}